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Deer Sailors, With your GPS, you can do a lot for and with OpenStreetMap...

Marine navigation explains how to map the many natural and man-made features associated with the safe movement of ships and boats on the sea. See Marine for details about more general features of the marine environment and Coastline for details about how to tag features found along and close to the shore. Waterways provides information about navigation of inland waterways.

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LOCODE covers 60,000 locations in 242 countries and 1000 regions. Among other things it is used to identify international seaports. The local-code consists of 5 characters. The first 2 descibe the country (ISO-3166-1) the last 3 following the location of the harbour.

World Port Index contains 4300 harbours in 400 regions. Every harbour has a 5-digit number as index.